Preparation

Make the peanut shortbread:

Line a straight-sided 13×9-inch metal baking pan with foil, letting the ends create an overhanging edge for easy removal.

In a medium bowl, stir together the butter, sugar, and salt. Stir in the flour and peanuts to make a stiff dough. Press the mixture evenly into the bottom of the prepared pan. Prick the dough all over with a fork. Refrigerate the pan for 30 minutes (or freeze for 5 to 7 minutes), until the dough is firm.

Meanwhile, position a rack near the center of the oven and heat the oven to 325°F.

Bake the dough for 20 minutes, then decrease the oven temperature to 300°F and bake until the crust is golden-brown all over and completely set, 20 to 25 more minutes. Let the crust cool completely before topping.

Make the peanut butter filling:

Put the peanut butter and butter in the bowl of a stand mixer fitted with the paddle attachment and beat on medium speed until smooth, about 1 minute. Add about half of the confectioners’ sugar to the mixer along with the vanilla extract and 1 Tbs. hot water. Beat on low speed until combined, then on medium speed until smooth and fluffy, about 1 more minute. Beat in the remaining sugar and mix, about 1 more minute, until the mixture is smooth and thick, like frosting. If the filling seems too stiff, add another 1 Tbs. hot water and beat for another minute.

With a knife or metal offset spatula, spread the filling over the fully cooled crust. The filling may not spread smoothly and evenly, but don’t worry; the ganache will cover it.

Macke the ganache:

Put the chocolate in a small heat proof bowl. In a small saucepan, bring the heavy cream to a boil. Remove from the heat and pour over the chocolate. Let sit for 3 minutes. Stir gently with a rubber spatula until combined and smooth.

Spread the ganache over the peanut-butter filling with a metal offset spatula to coat evenly. Let the bars sit at least 3 hours to allow the ganache to set before cutting (or refrigerate for 1 hour).

Carefully lift the bars from the pan using the foil sides and transfer them to a cutting board. Separate the foil from the bars by sliding a spatula between them. Cut the bars into 1-1/2-inch squares.

Tip

For the best results, measure your flour by weight instead of volume. (1 cup of all-purpose flour equals 4-1/2 oz.) If you don’t have a scale, be sure to use the proper technique when filling your measuring cups.

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OK, but not my favourite chocolate &amp; peanut butter combination. I was surprised at how not-sweet the base was, but I'd leave it alone. I did 1 cup instead of 1.5 cups of sugar with the filling, and I prefer that sweetness level, but there wasn't enough filling overall, I'd double the peanut butter layer. There also wasn't enough chocolate layer to easily cover the hills and valleys from getting the peanut butter layer in place. I'd increase the chocolate by 50% and the whipping cream by 25%.

Made these on the weekend --- for such a simple recipe, they are delicious and addictive. My husband said they're like something you'd buy from a bakery. I mostly followed the recipe but only used 1 cup icing sugar in the peanut butter layer (and no hot water). I increased the chocolate a wee bit (7 oz) just to be on the safe side. They were snapped up very quickly (I had to hide some in the freezer). BTW, to vegetarianswife, I put the pan in the 'fridge for a couple of hours, then lifted the foil out of the pan and used a large chef's knife to cut into bars before I peeled the foil off. The squares cut cleanly for a nice presentation.

These have become one of my Christmas cookie staples as they are always requested. If you love PB/Choc combo, they are the best! I am one to fiddle with recipes but follow this one as written--and use good quality chocolate as it makes a difference. Rich and yummy!